The talon locking is a test of will and strength. It is used to prove superiority and/or suitability. Potential mates will use this display to determine if the other eagle has the heart and fierceness needed to mate and raise offspring. Competitors for fish (as in this case) will claim a spot for fishing by besting the other eagle. Sometimes even 1 year-old eagles will engage in this arial display as they practice for the more serious business of growing up and finding a mate in their 4th or 5th year.